Plunger fastening device



FIG. 1 is a perspective view of a plunger fastening device, showing my new design;

FIG. 2 is front view thereof;

FIG. 3 is a back view thereof;

FIG. 4 is a side view thereof;

FIG. 5 is another side view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof; and,

FIG. 8 is another view thereof showing a plunger fastening device of the present invention in an environment in which it may be used, with a plunger of a syringe (shown in phantom) fastened to a user's hand (shown in phantom).

Any broken lines showing portions of the plunger fastening device, the environment (which includes a syringe and a hand), or features thereof form no part of the claimed design. 

CLAIM The ornamental design for a plunger fastening device, as shown and described. 